The TF1913(TM) is a low-profile, left side-folding triangle design compatible with all platforms featuring an M1913 (Picatinny) interface at the rear of the receiver. This complete assembly offers pull-through opening and provides a solid lock-up when extended. Complete assembly, ready-to-install Advanced steel hinge design locks in both folded and extended positions Pull-through design offering quick deployment Rigid polymer substrate with flexible arm cuff US veteran designed and proudly made in the USA Complete assembly Adjustable nylon strap